How are the encoders wired?

See circuit diagram below.

Can I extend the encoder wires or put switches in them etc.?

Yes. Keep length to 10 feet maximum for reliable operation. Switches in the lines are no problem.

Can I “Y” two sets of encoders (lathe and mill) together and connect them to one readout?

No, this won’t work, you’ll have to remove them and swap them.

Is there a point in the circuit where I can tap off serial data, RS-232, etc to input to my computer?

No there isn’t such a point and it wouldn’t be possible to do with the existing design.

I notice the X-axis reads “backwards.” Is it possible to change this?

Yes, it’s simple to reverse any axis if you’re handy with a soldering iron. You reverse the black and green wires at the encoders. Details are included in the latest revision of the manual on the web site.

I moved the display to the top of my speed control housing as suggested in your tips section and the display contrast is worse and its hard to see, can this be adjusted?

Yes, there is a contrast potentiometer on the board on the opposite side of board from all the connections. Adjust it slowly while looking at the display in the position you’ll use it.

If I have a CNC machine and I mount the encoders on the back of the motor, can the DRO keep up?

Yes, no problem. This has been tested to very high speeds.

I’d like to modify the DRO software so it will do “X”, can I get the internal software that it runs?

No, I’m sorry this isn’t possible.

Can the Sherline encoders and sensors be used with other systems?

Probably, although we can’t give you much support beyond what is already offered in the instructions. The circuit diagrams attached have the components that are on the DRO side of the circuit for the encoders. They are programmed to be used with either a 20 thread per inch or 1 mm pitch leadscrew. Other pitch leadscrews will not yield correct numbers.

What are the spec’s for the power connector on the DRO?

It’s a barrel connector with a 5.5mm OD and a 2.1mm ID. Center is positive 9V.

Circuit Diagrams For Position Sensors

Click on either diagram to view or larger version of file.